//
// Created by wze-zero on 2024/9/7 007.
//
#include <iostream>

using namespace std;

int main() {
    int x, y, x1, y1;
    cin >> x >> y;
    cin >> x1 >> y1;
    if (x == x1) {
        y < y1 ? cout << 'u' << endl : cout << 'd' << endl;
    } else if (y == y1) {
        x < x1 ? cout << 'r' << endl : cout << 'l' << endl;
    }
    return 0;
}